对象的克隆

package Cloneable;
class Student implements Cloneable
{
  String name;
  int age;
  Father f;
  int[] a = {1,2,3};
  Book[] books;
  Student(String name,int age,Father f,Book[] books)
  {
    this.name = name;
    this.age = age;
    this.f = f;
    this.books = books;
  }
  public String toString()
  {
    String book = "";
    for(Book b:books)
    {
      book+=b;
    }
    return "名字:"+name+" 年龄:"+age+" "+f+" "+book;
  }
  public Student clone() throws CloneNotSupportedException
  {
    Student s = (Student)super.clone();
    s.f = this.f.clone();
    s.a = this.a.clone();
    s.books = this.books.clone();//克隆数组的引用
    for(int i=0;i<books.length;i++)//克隆数组里面具体的内容
    {
      s.books[i] = this.books[i].clone();
    }
    return s;
  }
};
class Father implements Cloneable
{
  int age;
  String name;
  Father(String name,int age)
  {
    this.name = name;
    this.age = age;
  }
  public String toString()
  {
    return "父亲名："+name+" 父亲年龄:"+age;
  }
  public Father clone() throws CloneNotSupportedException
  {
    return (Father)super.clone();
  }
};
class Book implements Cloneable
{
  String name;
  Book(String name)
  {
    this.name = name;
  }
  public String toString()
  {
    return "书名:"+name;
  }
  public Book clone() throws CloneNotSupportedException
  {
    return (Book)super.clone();
  }
};
class CloneTest
{
  public static void main(String[] args) throws CloneNotSupportedException
  {
    Father f = new Father("liyi",45);
    Book[] books = {new Book("java"),new Book("C语言"),new Book("web-1")};
    Student s1 = new Student("lili",25,f,books);
    Student s2 = s1.clone();
    System.out.println(s1);
    System.out.println(s2);
    System.out.println(s1==s2);
    s1.name = "lucy";
    System.out.println(s1);
    System.out.println(s2);
    s1.f.name = "Micro";
    System.out.println(s1);
    System.out.println(s2);
    s1.a[2] = 100;
    System.out.println(s2.a[2]);
    System.out.println(s1.books==s2.books);
    s1.books[0].name = "神雕侠侣";
    System.out.println(s1);
    System.out.println(s2);
  }
};

 

package clone;
class Students2 implements Cloneable//实现Cloneable接口表示可以被克隆
{
   String name;
   int age;
   int []a={1,2,3,4,5};
   Father f=new Father("java",80);
   Students2(String name,int age)
   {
      this.name=name;
      this.age=age;
   }
   public Students2 clone()throws CloneNotSupportedException
   {
      return (Students2) super.clone();//具体的克隆操作由父类来完成
   }
   public String toString()//重写toString()方法
   {
      return "姓名:"+name+"年龄:"+age;
   }
}
class Father implements Cloneable//实现Cloneable接口表示可以被克隆
{
 String name;
 int age;
 Father(String name,int age)
 {
    this.name=name;
    this.age=age;
 }
 public Father clone()throws CloneNotSupportedException
   {
      return (Father) super.clone();
   }
 public String toString()
 {
   return "姓名:"+name+"年龄:"+age;
 }
   
}
class StudentTest1 
{
   public static void main(String[] args) throws CloneNotSupportedException 
   {
      Students2 s1=new Students2("lili",25);
      Students2 s2=s1.clone();
      System.out.println("对象的克隆:");
      System.out.println(s1);
      System.out.println(s2);
      int []b=s1.a.clone();
      System.out.println("数组的克隆:");
      System.out.println("原始的数组:");
      for(int i:s1.a)
      {
         System.out.print(i+" ");
      }
      System.out.println("\n克隆后的数组:");
      for(int i:b)
      {
         System.out.print(i+" ");
      }
      System.out.println("\n类的克隆:");
      System.out.println("原始对象:");
      System.out.println(s1.f);
      Father ff=s1.f.clone();
      System.out.println("克隆后的对象:");
      System.out.println(ff);
     System.out.println("克隆后重新为原对象赋值，看看克隆的对象与被克隆的对象的值是否发生改变:");
     for(int i=0;i<s1.a.length;i++)
      {
        s1.a[i]=5-i;
      }
      System.out.println("\n重新为a赋值后，a数组的内容变为:");
      for(int i:s1.a)
      {
         System.out.print(i+" ");
      }
      System.out.println("\n但是b克隆a的内容还是:");
      for(int i:b)
      {
         System.out.print(i+" ");
      }
      System.out.println("\n重新为Fathe f赋值后，f的内容变为:");
      s1.f=new Father("Java SE",100);
      System.out.println(s1.f);
      System.out.println("为F赋值后，但是克隆f的对象ff的内容还是:");
      System.out.println(ff);

   }

}